A diagnostic tool for microbends in fiber termination as a source of FRD

David W. Coutts*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

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Abstract

Microbends in multimode optical fibers are shown to lead to focal ratio degradation which compromises fiber fed spectrograph design and performance. By propagating specific vortex mode patterns through multimode fibers containing a single controlled microbend the mechanisms for FRD can be understood. For example, we see both experimentally and through ray tracing analysis that a microbend can produce spiral patterns in the far-field. These patterns are potentially useful tools for diagnosing termination problems in fiber assemblies. For example, by analyzing the spiral patterns produced by a single microbend it is possible to determine the location of a microbend hidden in the fiber termination.

Original languageEnglish
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
EditorsRamón Navarro, Roland Geyl
Place of PublicationBellingham, Washington
PublisherSPIE
Pages1-8
Number of pages8
ISBN (Electronic)9781510619661
ISBN (Print)9781510619654
DOIs
Publication statusPublished - 10 Jul 2018
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018 - Austin, United States
Duration: 10 Jun 201815 Jun 2018

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume10706
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018
CountryUnited States
CityAustin
Period10/06/1815/06/18

Bibliographical note

Copyright 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Keywords

  • Focal ratio degradation
  • Microbends
  • Optical fibers
  • Radial velocity
  • Spectrographs
  • Termination
  • Vortex beams

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  • Cite this

    Coutts, D. W. (2018). A diagnostic tool for microbends in fiber termination as a source of FRD. In R. Navarro, & R. Geyl (Eds.), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III (pp. 1-8). [107066E] (Proceedings of SPIE; Vol. 10706). Bellingham, Washington: SPIE. https://doi.org/10.1117/12.2314194